Ashish Kumar (Ashfame)

Plugin offers a admin screen to select the posts of which commentators should be emailed, and then you can write the subject & message to send and the plugin will send them an email along with their comment history on the selected posts.
You also have the option of excluding list of emails and specifying a Bcc email address.
If you find a bug, please report the issue here – https://github.com/ashfame/email-posts-commentators/issues

Email Posts Commentators

Sergey Biryukov

Allows to receive e-mail messages in character sets different from the blog charset.
Based on the original plugin by Anton Skorobogatov, the founder of Russian WordPress community.

wp_mail Cyrillic

Allows to receive e-mail messages in character sets different from the blog charset.

Email Posts Commentators vs wp_mail Cyrillic